Centrifugal screen



3 SheetsSheet 1.

(No Model.)

B. R. DUDLEY. UENTRIFUGAL SCREEN.

Patented Sept. 25, 1894.

INVEN r0 me ucnms versus :0. womumo, msmnamu. o. c.

(No Model.) a Sheets-Sheet 2.

E. R. DUDLEY. GENTRIFUGAL SCREEN.

No. 526,618. Patented Sept. 25, 1894.

'ITNE s. INVENTOH (No Model.) 3 Sheets-Sheet 3.

E. R. DUDLEY. GENTRIPUGAL SCREEN.

No. 526,618. Patented Sept. 25, 1894.

INVENTOR BY Q I A OHNEYS,

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UNITED STATES PATENT OFFICE.

ELLIOTT R. DUDLEY, OF LEWIS RUN, ASSIGNOR TO PULASKI B. BROUGHTON,

OF BRADFORD, PENNSYLVANIA.

CENTRIFUGAL SCREEN.

SPECIFICATION forming part of Letters Iatent No. 526,618, datedSeptember 25, 1894.

Application filed March 24, 1894. $erial No. 504,976. (No model.)

To all whom it may concern.-

Be it known that I, ELLIOTT R. DUDLEY, a citizen of the United States,residing at Lewis Run, in the county of McKean and State ofPennsylvania, have invented certain new and useful Improvements inCentrifugal Screens,

of which the following is a specification.

My invention relates more particularly to screens for sifting clay usedin the manu IO facture of pressed brick, which is generally dried andsifted, and its object is to overcome the objectionable features of theinclined reciprocatin g screens which are commonly used, and myinvention consists broadly of a dishshaped woven wire screen secured toa revolving shaft, and provided with scrapers at its outer periphery,which work in a trough, into which the tailings of the material to besifted drop from the screen, and this trough, constructed preferably ofmetal, is provided with two bottoms and is adapted to have steam passedthrough them to keep the clay in it dry and prevent its sticking to thetrough and to the scrapers while being removed from the said trough; andmy invention further consists of certain novel features of constructionthat will be hereinafter fully described and specifically pointed out inthe claim.

Referring to the accompanying drawings which form a part of thisspecification, Figure 1 is a side elevation of my improved screen. thedriving mechanism being removed, and

Fig. 3 is a vertical section taken on the line 5 A-B, Fig. 2.

In the said drawings: 1 represents the base of the screen, whichsupports the trough 2. This trough is provided with the bottoms 3, 4,forming the space 5, through which steam is forced to keep the clay dryand to evaporate any moisture which may be in it, in order to preventits sticking to the trough or scrapers which are carried by the screen.The steam is introduced into this space by means of the 5 pipe 6 andexhausted through the pipe 7.

Secured to the base 1, and extending up over the screen are two A-shapedsupports 8, 9, connected together at their tops by the cross-piece 10.These parts are further connected and supported by means of the braces11, 12. This cross-piece 10 forms a support Fig. 2 is a plan view of thesame,

for the journals 13, let, of the shaft 16 which carries the drivingpulley 15 and also the pinion 17.

18 representsa journal opening in the crosspiece 10 for the upper end ofthe shaft 19, and which is journaled in a sleeve 20 at its lower endlocated in one of the cross-pieces of the base 1. This shaft carries thebevel wheel 21, which meshes with the pinion 17 on the driving shaft,and it is provided with the grooved collar 22 which rests on the groovedplate 23. Balls 24. are interposed between the collar and plate, to forma frictionless bearing between them.

25 represents the woven-wire dish-shaped screen, which is carried by andsupported at its outer periphery on the curved arms 26 mounted on theshaft 19. The screen is further secured at its outer periphery by meansof the metal band 29 which rests on the flanged ends of the arms 26, andit is supported at its inner periphery by means of the flanged collars27, 28, carried by the shaft 19, it being secured between them by meansof rivets or bolts.

30 represents the scrapers also carried by the arms 26, and which workin the trough 2 to carry the tailings contained therein to an opening 31in the trough and into a chute 32 which conveys them off to a crusher,from where they are again returned to the screen by means of the chute33. The sifted material drops through the screen iuto a suitablereceptacle (not shown) and from there conveyed to any desired point.

The objects in constructing the screen dishshaped are as follows:-Thechute 33 conveys the materiah to be sifted to a point near the center ofthe screen (as shown) the speed of which at this point is very muchslower than at the outer periphery, and unless there was an incline tothe screen the material would pile up at this point, and would notreadily sift through. The particles that do not sift through the screenat this point are thrown from the center of the screen by the rotarymovement thereof toward its periphery, and in order to retard the speedof these particles and prevent them being thrown ed, the screen as itapproaches its outer periphery is curved upward, which curve only allowsthe tailings [O dish-shaped screen carried by a shaft journaled in saidbase and supports, and adapted to be driven by the driving mechanism,scrapers carried by said screen and Working in the trough, said troughbeing provided with a suitable opening, and a double bottom throughwhich steam is forced, substantially as shown and for the purpose setforth.

ELLIOTT R. DUDLEY.

Witnesses:

BEN R. HAGAR, J. K. WILSON.

